ا استفاده از این فازمتر میتوان برق شهری و برق باتری را تست و اندازه گرفت. مهم ترین ویژگی این فازمتر، تشخیص جریان الکتریکی بدون تماس مستقیم با کابل است. شکل ظاهری این فازمتر شبیه به یک خودکار می باشد که به راحتی قابل جابجایی و استفاده در مکان های مختلف است. وجود نمایشگر دیجیتال بر روی این فازمتر باعث نمایش دقیق مقادیر اندازه گیری شده می شود.
بر روی این فازمتر یا تستر ولتاژ قلمی، چراغ ال ای دی تعبیه شده تا هنگام تماس با سطح، محل مورد نظر را بتوان در محیط تاریک دید و هم چنین وجود ال ای دی دیگری باعث
می شود تا وجود برق و ولتاژ را متوجه شد.
محدوده اندازه گیری ولتاژ ثابت و متناوب از 10 تا 220 ولت می باشد.
Non-contact voltage testers (also known as voltage tester pens, test pens, or voltage sensors) are the safest way of ensuring that electrical conductors do not have AC voltage present without touching the conductors and exposing yourself to an electrical shock. Non-contact voltage testers work by detecting the changing electric field around objects conducting an AC current (AC stands for “alternating current”).
When the device is placed near a live conductor, a capacitive voltage divider is established, comprising the parasitic capacitance between the conductor and the sensor, and between the sensor to ground (through the user’s body). When the tester detects current flowing through this divider, it indicates the presence of voltage.
Some amplified testers will give a stronger indication (brighter light or louder buzz) to gauge the relative strength of the detected field, thus giving some clues about the location of an energized object. Other testers give only a simple on/off indication of a detected electric field. Professional-grade testers will also have a feature to reassure the user that the battery and lamp are working.
These types of testers can be used on series-connected strings of mini Christmas lights to detect which bulb has failed and broken the circuit, causing the set (or a section of it) not to light. By pointing the end of the detector at the tip of each bulb, it can be determined whether it is still connected at least on one side. The first bulb which does not register is likely the one just past the problem bulb. (Burnt-out bulbs will still show as good if there is a bypass shunt which completes the circuit.) Flipping the set’s plug over and reinserting it in the outlet will cause the opposite end of the set or circuit to register instead.
AC voltage detector pens have different types of false-positive readings. Each tester has different settings based on the intended use and manufacturer:
Stray Voltage: is usually associated with dairies but it might show up in some residential neighborhoods. It’s associated with neutral connections within the utility supply lines.
Static Voltage: On some occasions, the voltage tester won’t show any voltage even if its held still. But as soon as you move the tester through the surface of the component, it will give you a positive reading. This might be some kind of residual voltage in your system and is a sign that the grounding/bonding system isn’t working properly.
Ghost Voltages: can be high enough to set off the device’s tester but have no current. Look for disconnected wiring that’s running parallel to the energized wiring.
Note: Before using any noncontact voltage tester, make sure to read, understand, and follow all instructions and warnings in the manual. This will help you more familiar with properly using your tester.